Replying for Paul - the ideal ignition curve will highly depend on the cam
being used (and of course other inherent characteristics such as valve
size and compression ratio). The best way to determine if one has the
best springs is to use a dyno, a lot of different springs, and a good ear
for ping. One can do this with the porverbial "drive it up a known hill"
dyno, but it's not quite as definitive or as easy - but it is a lot
cheaper.
Phil Bates
> Paul writes,
>
> > ...Of course, the newer dizzy that you have
> > would have an emissions friendly curve to it.
>
> Paul, there is nothing emissions-friendly
> about me. I feel that a few nicely tuned classics
> can't possibly make more emissions than 10 million
> Honda Accords. :-P
> Seriously though, a few years ago I restored a
> '63 E-type with serious advance curve woes. The
> DPO had changed the distributor springs. In fact,
> one was modified from a ball-point pen spring!
> I did some study and came up with the ideal
> street-profile advance curve for that XK engine.
> At the time, XKs Unlimited (I think it was) sold
> a spring kit to allow one to experiment with the
> curves. I still have a number of those springs
> around ... somewhere.
> Do you have published the (assumed) ideal
> street-profile advance curve for the 1500cc
> engine, either in MG or Triumph livery?
>
> Best regards,
>
> rick
|